123234243021 has 16 divisors (see below), whose sum is σ = 182575310400. Its totient is φ = 82153434384.

The previous prime is 123234243019. The next prime is 123234243043. The reversal of 123234243021 is 120342432321.

123234243021 is a `hidden beast` number, since 1 + 232 + 3 + 424 + 3 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 123234243021 - 2¹ = 123234243019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123234243061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064575 + ... + 1174643.

It is an arithmetic number, because the mean of its divisors is an integer number (11410956900).

Almost surely, 2^123234243021 is an apocalyptic number.

It is an amenable number.

123234243021 is a deficient number, since it is larger than the sum of its proper divisors (59341067379).

123234243021 is a wasteful number, since it uses less digits than its factorization.

123234243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151545 (or 151539 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 123234243021 its reverse (120342432321), we get a palindrome (243576675342).

The spelling of 123234243021 in words is "one hundred twenty-three billion, two hundred thirty-four million, two hundred forty-three thousand, twenty-one".